1 files changed, 7 insertions, 0 deletions
diff --git a/test-isblank.c b/test-isblank.c
new file mode 100644
index 00000000..f91232ac
--- /dev/null
+++ b/test-isblank.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int
+main(void)
+{
+	return(!isblank(' ') || !isblank('\t') || isblank('_'));
+}